Hi folks, I've got my eye on a used Sigma 135-400mm (canon fit)lens on ebay. It seems cheap, it's currently at £100. The listing states that it has one small speck of metal or dust on the inside of the front glass, but that it has no effect on the images. Is the seller right in saying it will not affect the images notably? And also, is this a good lens at a good price?

Any help and advice would be greatly appreciated, this is a rather large investment for a teenager!

You might see it at 135mm F/22, but that's very unlikely.
With longer lenses, you can practically stick your camera into a fence, and the gridlines won't show up, so I doubt that little speck will show up in your shots

_________________I take pictures so quickly, my highschool was "Continuous High".